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Income Taxes Deferred Tax (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Liabilities, Gross [Abstract]        
Depreciation and amortization $ 430.5 $ 456.2    
Depletion 613.5 430.1    
Partnership tax basis differences 59.3 66.3    
Other liabilities 37.6 39.1    
Total deferred tax liabilities 1,140.9 991.7    
Deferred Tax Assets, Gross [Abstract]        
Capital loss carryforwards 3.6 0.0    
Foreign tax credit carryforwards 736.7 775.1    
Net operating loss carryforwards 255.8 232.3    
Pension plans and other benefits 14.3 19.8    
Asset retirement obligations 369.4 337.3    
Disallowed interest expense under 163(j) 0.0 31.6    
Other assets 413.2 351.2    
Subtotal 1,793.0 1,747.3    
Net of valuation allowance        
Valuation allowance 909.9 774.7 $ 683.0 $ 1,457.1
Deferred Tax Assets, Net of Valuation Allowance 883.1 972.6    
Deferred Tax Assets, Net   19.1    
Deferred Tax Liabilities, Net, Total 257.8      
Anticipatory Foreign Tax Credit Carryforward        
Net of valuation allowance        
Valuation allowance 202.2 229.6    
Deferred Tax Liabilities and Assets [Line Items]        
Deferred Tax Assets Foreign Tax Credits Netted Against Related Deferred Tax Liabilities $ 202.2 $ 185.1